检索结果-南通市图书馆

Changes in foliar nitrogen resorption of Phyllostachys edulis with culm development

同方期刊数据库博看期刊评论

在线全文

学校读者我要写书评

暂无评论

Journal of Forestry Research 2019年第2期30卷 417-427页

作者： changshun zhang Chunlan Liu Wenyuan zhang Gaodi Xie Shaohui Fan Na Li Institute of Geographic Sciences and Natural Resources Research Chinese Academy of Sciences Beijing Municipal Research Institute of Environmental Protection College of Landscape and Art Jiangxi Agricultural University International Centre for Bamboo and Rattan University of Chinese Academy of Sciences

Leaf nitrogen resorption is very important to Phyllostachys edulis development because the withdrawn nitrogen can help newly emerging and growing ***, few studies have focused on the ontogenetic changes in leaf nitrogen resorption of P. edulis. Here, we examined the variability in mature leaf nitrogen concentrations(Nm), nitrogen resorption efficiency(NRE) and proficiency(NRP or Ns) and leaf-level nitrogen use efficiency(NUE) of the current-, 3 rd-and 5 th-year culms in *** stands under extensive management. Analyses of variance and correlation indicated that patterns of Nm,NRP, NRE and NUE were markedly affected by culm age and leaf nitrogen status. Nm, Nsand NRE were significant higher in younger(current-year) culms with 1-year lifespan leaves, while NUE was markedly higher in older(3 rd-or 5 th-year) culms with 2-year lifespan leaves. Significant linear correlations between Nmand NRP, NRE and NUE,Nmand NUE, Nsand NRE were found for each culm age,and Nmwas significantly positively correlated to NRE for all culms pooled. Higher proficiency in older culms led to higher NUE and lower NRE, these relationships can be modulated by Nm, which in turn, is restrained by leaf N availability and acquisition. Our results revealed that at the intraspecific level, P. edulis can adjust its leaf NRE, NRP,and leaf-level NUE in concert with culm *** nitrogen resorption characteristics and NUE of P. edulis can help decision-makers design appropriate deforestation strategies and achieve precise N fertilization for sustainable bamboo forest management.

关键词： Phyllostachys edulis Nitrogen resorption efficiency Nitrogen resorption proficiency Nitrogen-use efficiency Extensive management Culm development Precision fertilization

Research on the Patterns and Evolution of Ecosystem Service Consumption in Nepal

在线全文

学校读者我要写书评

暂无评论

Journal of Resources and Ecology 2022年第5期13卷 870-879页

作者： zhang changshun LIU Chunlan ZHEN Lin Institute of Geographic Sciences and Natural Resources Research Chinese Academy of SciencesBeijing 100101China School of Resource and Environment University of Chinese Academy of SciencesBeijing 100049 China Beijing Municipal Research Institute of Eco-Environmental Protection Beijing 100037China

The study of ecosystem service consumption(ESC)in Nepal not only helps us to understand the intensity and management level of Nepal’s ecosystem utilization,but also provides scientific data support for the establishment and planning of China’s aid to *** on the data of food consumption and forestry production and trade,this study dynamically investigated the consumption levels,structure and ecological consumption patterns of farmland,forest,grassland,water and the integrated ecosystem in Nepal and their main driving forces,using the physical quantity accounting *** results showed that the total consumption of farmland,forest,grassland,water and the integrated ecosystem in Nepal from 1961 to 2018 exhibited a fluctuating increase,with average value of 7.26 Tg yr^(-1),6.38 Tg yr^(-1),1.10 Tg yr^(-1),0.02 Tg yr^(-1) and 14.76 Tg yr^(-1),*** annual per capita forest consumption roughly decreased,while the annual per capita consumption of farmland,grassland,waters and integrated ecosystems mostly increased with their growth rates *** corresponding ecological consumption patterns were the“Log-Cereal-Milk”mode during 1961-1984,the“Log-Cereal-Vegetable-Root-Milk-Sugar”mode during 1985-2007 and the“Log-Cereal-Vegetable-Root-Sugar-Fruit-Milk”mode during *** study indicated that the supply capacity of the ecosystem(production,import and export capacity)and socio-economic factors(population density,per capita GDP and religious beliefs)are the main driving forces that are restricting the evolution of Nepal’s ecological consumption *** Nepal’s dietary structure has improved significantly,there is still a large gap between it and the standard of a balanced *** supply capacities of fruits,meat,eggs,milk and aquatic products should be enhanced to meet people’s demand for a balanced *** study can provide data support for the establishment of China’s aid projects to improve Nepal’s livelihood.

关键词： ecosystem services ecosystem services consumption ecosystem service consumption pattern Nepal

Analysis of Food Consumption and Its Characteristics in Uzbekistan based on the Emergy Method

在线全文

学校读者我要写书评

暂无评论

Journal of Resources and Ecology 2022年第5期13卷 842-850页

作者： JIA Mengmeng ZHEN Lin zhang changshun Institute of Geographic Sciences and Natural Resources Research Chinese Academy of SciencesBeijing 100101China School of Resource and Environment University of Chinese Academy of SciencesBeijing 100049China

Food resources play a great role in human livelihood,so it is meaningful to investigate their utilization and structural evolution,especially in developing *** study takes data from FAOSTAT and the World Bank,and applies the emergy method to analyze Uzbek food consumption changes and characteristics from 1992 to *** main results were obtained:(1)National food consumption showed a persistent increase and had a remarkable change in stages,with the first stage of low-level repetition,the second stage of speeding up and the third stage of high *** increase of animal-based food consumption was more notable than that of plant-based food consumption.(2)Per capita annual food consumption had a tendency of change that was similar to that of national food *** proportion of animal-based food in the total per capita annual food consumption usually remained about 2-fold higher than that of plant-based food *** main food consumption pattern was the combination of crops such as wheat and rice with meat such as *** fruit and vegetable consumption also *** the growing population,various changes in food demand will inevitably happen,so it is necessary to take sustainable measures in time to satisfy the new demand and to protect resources and the environment.

关键词： food consumption emergy method Uzbekistan

Research on the Patterns and Evolution of Ecosystem Service Consumption in the “Belt and Road”

在线全文

学校读者我要写书评

暂无评论

Journal of Resources and Ecology 2019年第6期10卷 621-631页

作者： zhang changshun ZHEN Lin LIU Chunlan LIANG Yihang Institute of Geographic Sciences and Natural Resources Research Chinese Academy of SciencesBeijing 100101China University of Chinese Academy of Sciences Beijing 100049China Beijing Municipal Research Institute of Environmental Protection Beijing 100037China School of Earth Science and Resource Chang’an UniversityXi’an 710000China

With great significance in ecosystem protection and sustainable development,the study of ecosystem service consumption(ESC)has become a hot topic in ecological *** on FAOSTAT data,in this study the patterns,composition and evolution of ESC and ecosystem service consumption patterns(ESCP)in the“Belt and Road"were revealed on the total and regional scales,taking consumed-biomass as a main *** main conclusions were reached.1)The total ESC was mainly contributed from farmland ecosystems along the"Belt and Road",followed by grassland *** ESC indicators on the whole system scale fluctuated,but increased from year 2000 to year *** total ESC increased from 12911.89 Tg yr_1 to 16810.00 Tg yr^1,and the annual per capita consumption of ecosystem services increased from 3.3228 million g p_1 yr'1 to 3.6392 million g p_1 yr'1.2)The ESC,composition and evolution varied significantly among countries,zones and *** annual per capita ESC was highest in Mongolia on the national scale,and highest in Central and Eastern Europe and lowest in Southeast Asia on zone scale,which represented the results from the joint effects of regional resource endowments,consumption habits,levels of productive forces,and other factors.3)Higher farmland ESC was the dominant ESCP,which accounted for about 76.7%of the total area along the"Belt and Road",followed by higher farmland+higher grassland ESC,which accounted for about 19.0%of the total *** other consumption patterns(i.e.,those of higher grassland ESC,higher forestland ESC or higher farmland+higher forest+higher grassland ESC)were found in only a few *** ESCP may be related to higher regional population density or the higher proportions of developing ***,to realize sustainable social,economic and ecological development,and to improve people's well-being,countries along the,lBelt and Road"should take advantage of their own resources in developing industries,actively expand

关键词： ecosystem services ecosystem service consumption farmland ecosystem service consumption grassland ecosystem service consumption forest ecosystem service consumption ecosystem service consumption pattern

Current Status and Advancements in Research of Plantation Nutrient Cycling

在线全文

学校读者我要写书评

暂无评论

Chinese Forestry Science and Technology 2006年第2期5卷 66-74页

作者： LI Kun zhang changshun SUN Yongyu Research Institute of Resources Insects Chinese Academy of Forestry Kunming 650224. P. R. China International Centre of Bamboo and Rattan Beijing100102 P. R. China

This paper introduces concepts and current research status of plantation nutrients cyclings, and analyzes main contents of plantation nutrients cycling as nutrients contents, accumulation and distribution of nutrients elements, understory species and forest litter. At the same time, the paper summarizes the problems in plantation nutrients cycling and its prospects.

关键词： nutrient cycling understory species forest litter prospects

Consumption of Ecosystem Services in Laos

在线全文

学校读者我要写书评

暂无评论

Journal of Resources and Ecology 2019年第6期10卷 641-648页

作者： LIANG Yihang ZHEN Lin JIA Mengmeng HU Yunfeng zhang changshun LUO Qi Institute of Geographic Sciences and Natural Resources Research Chinese Academy of SciencesBeijing 100101China School of Earth Science and Resource Chang'an UniversityXi'an 710000China School of Resource and Environment University of Chinese Academy of SciencesBeijing 100049China

The exponential increase of ecosystem utilization has instigated a serious conflict between ecosystem services and residents'*** Belt and Road Initiative has greatly influenced Laotian production and living,and the scientific assessment of the consumption of ecosystem services in Laos is important for exploring residents'influence on the *** on data for the Laotian consumption of agricultural products,fruits and livestock products during 1961-2013,normalized by either harvest index or feed conversion ratio,this study draws three main conclusions.1)Ecosystem service consumption in Laos is centered on the consumption of farmland,forestry and grassland ecosystem services,which account for over 80%,over 10%and under 2%,showing downward,upward and constant trends,*** consumption of these ecosystem services shows a trend of increasing first,then fluctuating,and finally increasing.2)The consumption of ecosystem services in Laos was characterized by the mode of"dominance of consumption of the farmland ecosystem services"from 1961 to 2008,and the mode of“balanced development of consumption of farmland,forest and grassland ecosystem services”from 2008 to 2013,with a trend of transformation from the former into the latter.3)The formation and change in the consumption mode of Laotian ecosystem services have been affected by both supply and *** developed agriculture mainly during the period from 1961 to 2008,forming the mode of"dominance of consumption of the farmland ecosystem services".This development benefited from the enriched varieties of imports as well as the increased value of trade and import ***,the consumption of ecosystem services in Laos after 2008 changed from the mode of“dominance of consumption of the farmland ecosystem services”to one of“balanced development of consumption of farmland,forest and grassland ecosystem services".This study provides an empirical reference for research on the consumption of ecosystem s

关键词： ecosystem services consumption characteristics mode variations

Research on Transmission Line Tower Tilting and Foundation State Monitoring Technology Based onMulti-Sensor Cooperative Detection and Correction

在线全文

学校读者我要写书评

暂无评论

Energy Engineering 2024年第1期121卷 169-185页

作者： Guangxin zhang Minghui Liu Shichao Cheng Minzhen Wang changshun Zhao Hongdan Zhao Gaiming Zhong College of Science and Technology(CST) Ningbo UniversityNingbo315000China Dadong Power Supply Company State Grid Liaoning Electric Power Co.Ltd.Dandong118000China Dalian Power Supply Company State Grid Liaoning Electric Power Co.Ltd.Dalian116000China Yanbian Power Supply Company State Grid Jilin Electric Power Co.Ltd.Yanji133000China Liaoyuan Power Supply Company State Grid Jilin Electric Power Co.Ltd.Liaoyuan136200China

The transmission line tower will be affected by bad weather and artificial subsidence caused by the foundation and other factors in the power *** tower’s tilt and severe deformation will cause the building to *** small changes caused the tower’s collapse,but the early staff often could not intuitively notice the changes in the tower’s *** the current tower online monitoring system,terminal equipment often needs to replace batteries frequently due to premature exhaustion of *** to the need for real-time measurement of power line tower,this research designed a real-time monitoring device monitoring the transmission tower attitude tilting and foundation state based on the inertial sensor,the acceleration of 3 axis inertial sensor and angular velocity raw data to pole average filtering pre-processing,and then through the complementary filtering algorithm for comprehensive calculation of tilt angle,the system meets the demand for inclined online monitoring of power line poles and towers regarding measurement accuracy,with low cost and power *** optimization multi-sensor cooperative detection and correction measured tilt angle result relative accuracy can reach 1.03%,which has specific promotion and application value since the system has the advantages of unattended and efficient calculation.

关键词： Transmission line tower tilting multi-sensor foundation state monitoring collaborative detection

Analysis of the Food Consumption Mode and Its Influencing Factors in Kazakhstan

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Resources and Ecology 2020年第1期11卷 121-127页

作者： LIANG Yihang ZHEN Lin HU Yunfeng YAN Huimin zhang changshun School of Earth Science and Resource Chang’an UniversityXi’an 710000China Institute of Geographic Sciences and Natural Resources Research Chinese Academy of SciencesBeijing 100101China School of Resource and Environment University of Chinese Academy of SciencesBeijing 100049China

The excessive influence of human activity has highlighted the dilemma between maintaining a stable ecosystem while satisfying consumer demands for *** has ecological problems caused by the conflict between humans and the land,grasslands and raising ***,this study of the food consumption modes in Kazakhstan aims to improve the sustainability of food consumption while maintaining the integrity of the *** on the data of food consumption in Kazakhstan in 2012 and 2016,and through the delineation of consumption modes and the analysis of their changes,this study found three very different food consumption modes in Kazakhstan-one dominated by milk and cereals;one by milk,cereals and meat;and one by milk,cereals,meat,vegetables and *** three modes were distributed separately in the northern,central and southern regions of Kazakhstan,*** is worth noting that food consumption in Kazakhstan is developing into a pattern of milk,cereals and *** with the different food consumption modes and their tendencies toward variations,the basic theories of food production need to be revised,and the exchange of information and cooperation between the different regions of Kazakhstan and relevant interests abroad should be encouraged in order to increase the well-being of local consumers.

关键词： food consumption consumption mode supply consumption habits

The Evaluation of Urban Green Space Landscape Changes and Ecosystem Services in Beijing

在线全文

学校读者我要写书评

暂无评论

Journal of Resources and Ecology 2022年第5期13卷 897-911页

作者： XIAO Yu GAN Shuang HUANG Mengdong LIU Jia MAO Hui zhang changshun QIN Keyu XIE Gaodi University of Chinese Academy of Sciences Beijing 100049 China Institute of Geographic Sciences and Natural Resources Research Chinese Academy of SciencesBeijing 100101China Graduate School of Media and Governance Keio UniversityFujisawa 2520882Japan College of Resources Sichuan Agricultural UniversitySichuan 611130China

As a very important part of the urban ecosystem,the urban green space system plays an active role in maintaining the urban ecosystem stability,providing ecosystem services,and improving the quality of the urban *** order to deal with the problems brought about by the deterioration of the urban ecological environment,it is necessary to study and analyze the spatial distribution pattern,evolutionary characteristics and ecosystem services of urban green space to maximize its ecological benefits and comprehensive *** this study,we took Beijing urban area as an example,and based on the spatial distribution data of urban green space and remote sensing data,we first calculated the urban green space type transition matrix,landscape pattern index and ecosystem ***,we analyzed the changes in urban green space landscape patterns,ecosystem services and their spatial distributions from 2000 to 2020,and studied the interactive relationships between landscape changes and changes in ecosystem *** results showed three key findings.(1)Beijing’s urban green space construction has achieved remarkable results from 2000 to *** area of green space has increased by 77.41%,mainly from cultivated land and construction land.(2)From 2000 to 2020,the amounts of dust retention,SO_(2) absorption,NO_(2) absorption,cooling and humidification,carbon fixation and oxygen release,and rainwater runoff reduction in Beijing’s urban green space have shown continuous increases in general.(3)There is a close relationship between urban green space landscape changes and green space ecosystem services,and total area(TA)has the highest correlation with ecosystem *** for rainwater runoff reduction,the correlation coefficients between TA and ecosystem services are all higher than *** research can provide theoretical guidance for optimizing Beijing’s green space and determining how to maximize the effect of green space for improving the ecological enviro

关键词： Urban green space landscape ecosystem services landscape index Beijing